Note: Some towns have few or no professional firefighters,
and fire suppression is conducted mostly by groups of
volunteers, called {volunteer firefighters}. The term
fireman[1] was at one time synonymous with firefighter,
until women began to engage in the same occupation.
[PJC]

fire fighter — one who fights or extinguishes fires … English contemporary dictionary

fire-fighter — person who puts out fires for a living … English contemporary dictionary

fire fighter — noun (C) someone who stops fires burning, either as their job or as a special helper during forest fires or wars … Longman dictionary of contemporary English

Fire Fighter Fatality Investigation and Prevention Program — The Fire Fighter Fatality Investigation and Prevention Program (FFFIPP) is administered by the National Institute for Occupational Safety and Health (NIOSH), part of the Center for Disease Controland Prevention (CDC). It performs independent… … Wikipedia